Machine Learning

The principle of hierarchy is essential for solving problems in the real world We are presented with a vast amount of information, and much of it is irrelevant or too complex to develop in detail It is not always practical to review all the information, to make all the calculations, to check all the possibilities, to pursue all the options When we deal with a large number of possibilities, we must arrange them in some sort of hierarchical classification When we try to solve a problem, we must identify the relevant information, select the most important possibilities, and isolate the crucial choices If we deal with a complex system, we must understand the principles operating at higher levels and the principles of organization at lower levels When we see a large number of possibilities, we can often simplify them by arranging them in an orderly list; we can classify them according to general categories When we see a large number of objects, we can often simplify them by arranging them in a hierarchy acco